Get a Toyota Corolla. I had a late 2000's years ago and I was able to fold the rear seat down opening the trunk to the cabin and the front seat down and could fit 10' boards inside. I am sure that the passenger seat leans back, lay it back as far as possible ? I am guessing that you have a regular cab and not some form of extended cab. My thought would be to build a plywood box for it to fit inside.
Woody
Woody